15q的远端三体或重复是一种非常罕见的染色体疾病;以前报道的大多数病例都来自涉及15号染色体和另一条染色体的不平衡易位,而其他机制(例如重复)很少报道。我们在此报告了一个非常罕见的产前部分15q三体,15q22.2-q26.3的42.64-Mb重复,由15号染色体(p11q22)的母体周心倒位引起,这不是不平衡易位或重复的结果,并且与伴随的部分二元化无关。胎儿超声显示12周时孤立性增厚的颈部透明层和妊娠中期的多个异常,包括早期生长限制,单侧脑室增宽,狭窄的透明隔腔伴有call体发育不全,单侧后轴多指,紧握的手和马蹄内翻足的脚趾,以及心脏发育异常和营养不足的特殊方面。本病例的独特方面可能有助于改善与远端重复15q相关的表型。据我们所知,这是首例有15q22.2-q26.3重复的产前诊断报告,该重复不是由不平衡的易位引起的,也没有伴随的单体成分.
Distal trisomy or duplication of 15q is a very rare chromosomal disorder; most of the previously reported cases were derived from unbalanced translocations involving chromosome 15 and another chromosome, whereas other mechanisms (e.g. duplication) have rarely been reported. We herein report a very rare prenatal
case of a partial 15q trisomy, a 42.64-Mb duplication of 15q22.2-q26.3, arising from a maternal pericentric
inversion of chromosome 15 (p11q22) that was not the result of an unbalanced translocation or duplication, and was not associated with concomitant partial monosomy. Fetal ultrasound revealed isolated thickened nuchal translucency at 12 weeks and multiple abnormalities in the second trimester, including early growth restriction, unilateral ventriculomegaly, narrow cavum septi pellucidi with hypoplasia of the corpus callosum, unilateral postaxial polydactyly, clenched hands and clubfoot with clawing of the toes, and a particular general dysplastic and hypotrophic aspect of the heart. The distinctive aspects of the present
case may help to refine the phenotype associated with distal duplication 15q. To the best of our knowledge, this is the first report of a prenatal diagnosis with a 15q22.2-q26.3 duplication that did not result from an unbalanced translocation and did not have a concomitant monosomic component.